Re: SQL / IIS Application Pool Identity

From: Paul Glavich [MVP - ASP.NET] (
Date: 10/17/04

  • Next message: Gaurav Vaish: "Re: Multiple Authentication Modes"
    Date: Sun, 17 Oct 2004 22:04:15 +1000

    Set the authentication tag in web.config to "windows" (this way it actually
    used windows integrated authentication) and turn off (disable) anonymous
    authentication in IIS management console for that virtual directory. This is
    only for authentication though. simply changing to defined application pool
    user (rigfht click on the app pool in IIS manager and select properties and
    go to the Identity tab). You can select a user to use here, and that context
    will be used to authenticate against SQL database. Note: Once you have
    enabled windows intgrated auth above, disable impersonation in the
    web.config, otherwise the user context/credentials will be used to connect
    to sql, which will obviously be different for each user.

    - enable windows auth as I mentioned above. This is so the user
    authentication is actually taking place.
    - disable impersonation in the web.config
    - change the user in the Identity tab of the properties of the Application
    pool to use a user you would like to connect to the sql database. Ensure
    that this user has correct access to your virtual directory for your web app
    and any temporary and required system file areas.

    - Paul Glavich
    Microsoft MVP - ASP.NET
    "Colin Bowern" <> wrote in message
    > Hi,
    > I've got an ASP.NET web application which uses Windows security with a SQL
    > Server database.  I want to use the application pool identity to make the
    > connection to the SQL server database.  If I set the authentication tag to
    > None and impersonation to false I get the following:
    > ===
    > Event Type: Error
    > Event Source: ExceptionManagerPublishedException
    > Event Category: None
    > Event ID: 0
    > Date:  10/15/2004
    > Time:  5:54:26 PM
    > User:  N/A
    > Computer: IPDDFZ0025ATL2
    > Description:
    > General Information
    > *********************************************
    > Additional Info:
    > ExceptionManager.MachineName: (removed)
    > ExceptionManager.TimeStamp: 10/15/2004 5:54:26 PM
    > ExceptionManager.FullName:
    > Version=1.0.1746.26470, Culture=neutral, PublicKeyToken=null
    > ExceptionManager.AppDomainName:
    > /LM/W3SVC/1518623831/Root-12-127423650871912556
    > ExceptionManager.ThreadIdentity:
    > ExceptionManager.WindowsIdentity: NT AUTHORITY\NETWORK SERVICE
    > 1) Exception Information
    > *********************************************
    > Exception Type: System.Data.SqlClient.SqlException
    > Errors: System.Data.SqlClient.SqlErrorCollection
    > Class: 14
    > LineNumber: 0
    > Message: Login failed for user '(null)'. Reason: Not associated with a
    > trusted SQL Server connection.
    > Number: 18452
    > Procedure:
    > Server:
    > State: 1
    > Source: .Net SqlClient Data Provider
    > TargetSite: System.Data.SqlClient.SqlInternalConnection
    > GetConnection(Boolean ByRef)
    > HelpLink: NULL
    > StackTrace Information
    > *********************************************
    >    at System.Data.SqlClient.ConnectionPool.GetConnection(Boolean&
    > isInTransaction)
    >    at
    > options, Boolean& isInTransaction)
    >    at System.Data.SqlClient.SqlConnection.Open()
    >    at InDIMENSIONS.Web.SmartForm.ContactForm.CreateContactRecord(String
    > inquiryType, String subject, String message, String name, String
    > emailAddress, String ipAddress, String fileName)
    > For more information, see Help and Support Center at
    > ===
    > Given that the app is running under the NETWORK SERVICE identity, would it
    > not use that to make the connection?
    > The application and SQL Server instance are on the same server, Windows
    > Server 2003.
    > The articles I've read on MSDN so far haven't been very clear about this.
    > Can someone provide an example or guidance on what I need to set to get
    > scenario working?
    > Thanks!
    > Colin

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